CXA3621GE データシートの表示（PDF） - Sony Semiconductor

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CXA3621GE

Fingerprint Sensor

Sony Semiconductor 

CXA3621GE

Sensor Array

Cs

Vcel

Cp

SVss

Sr

Vsl

S3

Cp'

SVDD

S4

Cf1

Vsns

S5

S_Amp

VDD

VM

Upper: Sensor cell

Lower: Dummy block

Dummy Block

Vceld

Cp

SVss

Sr

Vsld

S3

S4

Cf1

Vsnsd

S5

S_Amp

Cp'

SVDD

VDD

VM

SS

Cf2

Sc

Ssig

Ch1

P_Amp

VM

SD

Cf2

Sd1

Sdmy

Ch1

P_Amp

VM

S6

Cf3

Voi

Voo

Cs1

S7

O_Amp

VOS

Buffer Aout

Ch2

Sensor block

(192 × 128: Sensor cell)

(128: Dummy block)

Sense amplifier block

(192: Sensor cell)

(1: Dummy block)

Output block

(1)

Fig. 2

• Fingerprint sensor operation (Fig. 2)

Description of characters

Cs: Capacitance formed between the finger and the metal electrode

Cp: Parasitic capacitance formed between the metal electrode and the silicon substrate

Cp': Capacitance for canceling Cp (Cp ≈ Cp')

Ch∗: Hold capacitance

Cf∗: Feedback capacitance for determining the gain

S∗: Switch

V∗: Node voltage

VM =

1

2

VDD, VOS =

4

11

VDD

–9–

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